con 4 1 29 9 - jan 29 '59? is that 1 an I for sept?

my '58-'62 block has con 4 A 11 1, and it's my understanding that it means jan 11th '61. and on the distributor 'ledge' is, F0111A, which repeats the day/mo/yr but also says that it came from the flint, mi plant